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		<title>9.6  纵向文本</title>
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			svg{stroke: black;fill: none;width:400px;height:400px;border:1px dashed black;}
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			<text x="10" y="20" transform="rotate(90,10,20)">Rotated 90</text>
			<text x="50" y="20" style="writing-mode: tb;">Writing Mode tb</text>
			<text x="90" y="20" style="writing-mode: tb;glyph-orientation-vertical: 0;">Vertical zero</text>
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	</body>
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